Superradiant scattering of electromagnetic waves emitted from disk around Kerr black holes

Journal Article · Fri Oct 15 04:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.82.084026· OSTI ID:21433010

Kobayashi, Taichi; Tomimatsu, Akira ^[1]

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1. Department of Physics, Nagoya University, Chikusa-Ku, Nagoya, 464-8602 (Japan)

We study electromagnetic perturbations around a Kerr black hole surrounded by a thin disk on the equatorial plane. Our main purpose is to reveal the black hole superradiance of electromagnetic waves emitted from the disk surface. The outgoing Kerr-Schild field is used to describe the disk emission, and the superradiant scattering is represented by a vacuum wave field which is added to satisfy the ingoing condition on the horizon. The formula to calculate the energy flux on the disk surface is presented, and the energy transport in the disk-black hole system is investigated. Within the low-frequency approximation we find that the energy extracted from the rotating black hole is mainly transported back to the disk, and the energy spectrum of electromagnetic waves observed at infinity is also discussed.

• OSTI ID: 21433010
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 8 Vol. 82; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
APPROXIMATIONS
BLACK HOLES
CALCULATION METHODS
DISTURBANCES
ELECTROMAGNETIC RADIATION
EMISSION
ENERGY SPECTRA
ENERGY-LEVEL TRANSITIONS
GRAVITATIONAL FIELDS
KERR FIELD
MAGNETIC DISKS
MAGNETIC STORAGE DEVICES
MEMORY DEVICES
PERTURBATION THEORY
PHOTON EMISSION
RADIATIONS
SCATTERING
SPECTRA
STIMULATED EMISSION
SUPERRADIANCE